1 /***
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that the following conditions are
4 * met :
5 *
6 * . Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 *
9 * . Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * . The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $Id: Input.java,v 1.12 2005/09/10 11:26:47 mat007 Exp $
29 */
30
31 package jtge.engine.io;
32
33 import jtge.engine.command.ICommand;
34 import jtge.engine.handler.AbstractProducer;
35 import jtge.engine.handler.IConsumer;
36
37 /***
38 * Handles the input logics.
39 * <p>
40 * This class acts as the abstraction in the bridge pattern.
41 *
42 * @author Mathieu Champlon
43 * @version $Revision: 1.12 $ $Date: 2005/09/10 11:26:47 $
44 */
45 public class Input extends AbstractProducer implements IInput
46 {
47 private final IDisconnectionObserver observer;
48 private final IInputImp input;
49
50 /***
51 * Create an input.
52 *
53 * @param consumer the consumer to forward the read commands to
54 * @param observer the observer
55 * @param input the input implementation
56 */
57 public Input( final IConsumer consumer, final IDisconnectionObserver observer, final IInputImp input )
58 {
59 super( consumer );
60 if( observer == null )
61 throw new IllegalArgumentException( "argument 'observer' is null" );
62 if( input == null )
63 throw new IllegalArgumentException( "argument 'input' is null" );
64 this.observer = observer;
65 this.input = input;
66 }
67
68 /***
69 * {@inheritDoc}
70 */
71 public final void read()
72 {
73 while( !isClosed() )
74 {
75 final ICommand command = input.read();
76 if( command != null )
77 forward( command );
78 else if( isClosed() )
79 observer.closed( this );
80 else
81 throw new InputOutputException( "null command from input" );
82 }
83 }
84
85 /***
86 * {@inheritDoc}
87 */
88 public final void close()
89 {
90 if( !isClosed() )
91 {
92 input.close();
93 observer.closed( this );
94 }
95 }
96
97 /***
98 * {@inheritDoc}
99 */
100 public final boolean isClosed()
101 {
102 return input.isClosed();
103 }
104 }